Familiarizing the extraterrestrial : making our planet alien

A growing number of researchers in the social sciences and the environmental humanities have begun to focus on the wider universe and how it is apprehended by modern cosmology. Today the extraterrestrial has become part of the remit of anthropologists, philosophers, historians, geographers, scholars in science and technology studies, and artistic researchers, among others. And there is an emerging consensus that astronomers and other natural scientists"”contrary to a common prejudice"”are never simply depicting or describing the cosmos "just as it is." Their research is always characterized by a specific aesthetic style and by a particular "cosmic imagination," as some have called it. Scientific knowledge of the universe is based on skilled judgments rather than on direct, unmediated perception. It is science, but it is also an art. This special section focuses on two at first sight contradictory aspects of this cosmic imagination. On the one hand, there is a distinctive move toward viewing the extraterrestrial in familiar terms and comprehending it by means of conceptual frameworks that we, earthlings, are accustomed to. On the other hand, there is a tendency to understand our own planet in unfamiliar terms, especially in astrobiology, where so-called analog sites and "extreme environments" provide clues about alien planets.